Recombinant CCN1 protein (wild-type, DM and D125A mutants) were produced in insect cells using a baculovirus system and purified as described (8 (link)). Immuno-blotting employed rabbit polyclonal anti-phospho-p53 (Ser15) and mAb against phospho-p38 MAPK (Thr180/Tyr182, D3F9), lamin A/C (4C11), and cytochrome c (D18C7) were from Cell Signaling Technology. Rabbit anti-EGFR (EP38Y) mAb was from AbCam. Rat anti-integrin α6 mAb (GoH3) was from Beckman Coulter.